Re: [PATCH v1] dmaengine: tegra-apb: Error out if DMA_PREP_INTERRUPT flag is unset
From: Vinod Koul
Date: Tue Jun 04 2019 - 08:23:20 EST
On 30-05-19, 00:43, Dmitry Osipenko wrote:
> Apparently driver was never tested with DMA_PREP_INTERRUPT flag being
> unset since it completely disables interrupt handling instead of skipping
> the callbacks invocations, hence putting channel into unusable state.
> The flag is always set by all of kernel drivers that use APB DMA, so let's
> error out in otherwise case for consistency. It won't be difficult to
> support that case properly if ever will be needed.